Pipe-bending machine



Dec. 19, 1922.

NI. L. PETERSON. PIPE BENDING MACHINE..

2 Shins-SHEET x.

FILED OCT. 29, |920.

Q, .....m mm 2.3i --1 Dec.` 19, 1922.

M. L. PETERSON.

PIPE BENDING MACHINE.

FILED ocT. 29, 1920.

"l lll Q1 flamme/12a atente Der. 19, 1922.

MARTIN L. PETERSON, OF DETRTfMICEIGAN.

pira-Banniere. Macallan n Application file/d ctober 29, i920. Serialtifo. af.

To all whom tmay concern:

Be it known that l, MARTIN L. PETERSON,

a citizen of the United States of America,-

residing at Detroit, in the county of Wayne and State of Michigan, haveinvented certain new and useful Improvements in Pipe-Bending Machines,of'which the following 1s a specification, reference being had therelnto the accompanying drawings.

This invention relates to a machine for bending pipe, tubes, wire, rodsandthe like and more particularly to a machine, for forming continuouscoils from such materials. An object of the invention is' to provide amachine which is adapted to form from a straight piece of pipe or thelike of any desired length, va continuous coil of aniform or varyingdiameter, and further, to' form two or more coils of different diametersfrom a single continuous piece of tubing or the like, with the severalcoils arranged con-A centrically, one within the other. A further objectis to cheapen and Ifacilitate the operation of bending and coiling stockof any desired diameter or length and securing accuracy and uniformityin the diameter and spacing of the turns of the coils.

A further object isto enable the o erator during a continuous operationof t e machine, to vary the diameter of the turns of a coil at will andto accurately graduate a turn of one diameter int0,another turn of adifferent diameter during such continuous'operation. f A

It is also an object of the invention to enable the operator to form anydesired number of pieces or lengths of stock into separate coils with acontinuous operation of the machine, and to provide simple means foradjusting the machine, whichv means maybe adjusted to vary the productduring the continuous operation of the machine.

It is also an object to provide novel means for feeding and forming thestock whereby the use of separate forming or like devices fon each sizeor. form of coil is dispensed with, and to provide certain other new anduseful features, allv as will hereinafter more fully appear,

lVith the above and other -ends in view, the invention consits in thematters hereinafter` set forth, and incre particularly pointed out 1nthe appended claims', reference being had to the accompanying drawvin s,in whichigure l is a side elevation of a machine illustrativev of theinvention; 4 l

Fig. 2, a plan view of the same;l

Flg. 3 an enlarged sectionalA4 detail of the bendmg rolls and adjacentparts;

Fig. 4 an enlarged transverse section 'of the carrier and showing a tubein place thereon; ,y

F .5, a'detail of a short portion of the carrier in side elevation witha tube in place thereon;

Fig, 6 is a detail illustrative of the manner 1n which a single coil isformed with .evenly spaced turns;

Fig. 7 is a similar view illustrative of the manner of formingconcentric coils from a single piece of tubing, and

ig. 8 isa detail illustrative of the manner 1n which concentric coilsare formed, and showing the same in endl elevation, together wlth thebending rolls.

It has `been known that. tubing and the like ma' be bent by running itbetween rolls, but di culty has always been encountered in-forming bythis method coils having turns of uniform diameter and spacing. Thisuniformity is secured throu h the manner in which the rolls are placedand the manner in which the tubing is run between them. So faras knownto applicant he is' the first to .devise a'machine which will formconcentric coils of different diameters from a lcontinuous piece oftubing or the like and with a continuous movement -of'the stock throughthe machine.

The bending rolls are indicated in the accompanying drawing by thenumerals 1, 2, and 3, the roll 1 being supported in a mannerto engagethe upper side of the tube or other member to be bent and the roll 2being located below the tube being bent and slightly forward of the rolll in the direction of the travelof the tube therebetween. The roll-3 isalso located below the tube but to the rear of the roll l in thedirection of travel 'of the tube and this roll 3 is carried by asuitable movable support so that it may tion of the machine this roll isfirst loweredso that the end of the tube may be inserted between therolls 1 and 2 and then by raising the lroll 3 relative to the rolls `land 2 the pipe or tube is given the desired .bend as it is forcedendwise between the roll 1 and the opposed rolls 2 and 3. The degree ofelevation of the roll 3 relative to the rolls 1 and 2 determines theamount of the bend which will be given the tube and this particulararangement of the roll 1 intermediate the rolls 2 and 3 and the positionof the roll 1 rearwardly of the roll 2 gives the setting action orpermanent bend which accuratelydetermines the diameter of each turn ofthe finished coil. The roll 3 simply determines the angle or inclinationat which the tube is fed to the rolls 1 and 2 and therefore the amountof the bend which will be put in the tube, but the rolls l and 2 givethe setting action which takes the spring out of the turn of the coiland gives/it a permanent set or bend. The coiled or bent portion of thetube issues from between the rolls 1 and 2 freely, as the tube is-forced through between these rolls in contradistinction to being pulledthrough or fed by a positive drive of 011e or more of the rolls, andtherefore the turns of the coil retain the set or permanent curvatureimparted to them by the rolls 1 and 2, which set determines the diameterof the turns and makes them uniform.

In order that the several turns of the coil may be accurately spacedapart and that the coil as it is progressively formed will be projectedlaterally away from the path of that portion of the tube issuing frombetween the rolls, a thrust member is placed in a position to engage oneside of the tube after it issues from between the rolls so that theformed turn of the coil will be pushed sidewise or in a'directionlongitudinally of the coil, bending the pipe or tube laterally as it isformed and thus, by such bending action determining the spacing of theturns. This thrust member preferably comprises a roll 4 which is rigidlysupported in any convenient manner and properly positioned to engage theside of the tube, preferably at a short distance beyond the roll 2.

By so mounting this thrust roll 4 that it may be shifted from one sideof the issuing tube to the other, the direction of travel of the coillaterally from its normal path and longitudinally of the coil in eitherdirection,may be changed at will and .therefore, as illustrated in Fig.7, a'double coil or a coil of small diameter continuouswith a-coil ofgreater diameter and said coils in concentric relation, with the largercoil surrounding the smaller,- -may be formed. This is accomplished byproviding a length of tube or other stock which is great enoughv to formboth coils, then 'setting the roll 3 so that the coil of thesmallestdiameter will be formed. After the desired length of coilhas beenformed, the roll 3 is gradually lowered during the formation of a turnof the coil, thus gradually increasing the diameter of this particularturn until it reaches the diameter at-which it is desired to form thelarge coil, the thrust roll 4 being shifted from one side of the tube tothe other atthe beginning of the increase of diameter of the turn overthe diameter of the smaller coil. This shifting of the thrust roll' fromone side of the tube to the other will reverse the direction of thetravel of the coil laterally or in a longitudinal direction of the coilas it is progressively formed, thus forming the larger coil, outside ofand concentrically with the small coil. The space between the inner andouter coils will, of course, be limited by the size of the roll 1 asthis roll in forming the outer coil must lie outside the plane of theinner coil which must travel past and over this roll during theformation 'of the outer coil.

The above described method of coiling a tube, wire, rod, or othersimilar length of Stock is illustrated in Figs. 6, 7 and 8 of thedrawing, the supports for the several rolls, and means for adjusting thesame being omitted from these figures.

In Figs. 1 to 5 inclusive, an organized machine is illustrated and asshown therein the roll 1 is carried by a suitable bracket or support 5which is pivoted at 6 upon the base 7 of the machine so that said -rollmay be adjusted toward or from the roll 2 by swinging this bracket uponits pivotal support, in any suitable manner, as by an adjusting screw 8indicated in dotted lines in Fig. l. The roll 2 is mounted in suitablebearings upon a fixed support 9 on the base of the machine and the roll3 is mounted in suitable bearings 10 carriedl by an adjustable frame 11which is pivotally supported at one end by the fixed support 9 to swingupon anl axis coincident with the axis of the roll 2, that is,

`one end of this frame is supported by suit- The base 7 ofthe machine isformed withan inclined track 14 upon which is mounted a carriage 15 andthis carriage is provided with suitable rolls 16 at its upper end toengage the underside of' the two parallelv v bars forming the adjustingframe 11 .which carries the roll 3.

mounted in suitable bearings upon the front end of the base 'of themachine. This drum may be turned 1n any suitable manne-r, but

This carriage maybe movedv along its track in any suitable man` .ner, asby'a cable 17 attached thereto and passing over and winding upon a drum`18 asshown in the drawing, its shaft 19 is provided'with a suitableclutch 20l for .connecting a sprocket wheel 21-thereto so. that motionwill be imparted to the shaft when the clutch is in operative positionthrough the medium of a sprocket chain 22 engaging the sprocket andpassing over a similar sprocket mounted upon the shaft of a suitablemotor 23 or other suitable driving .means -By operating the clutch 20the cable 17 is caused to be wound upon the drum 18 and the carriage 15thus moved up the inclined track, approaching the pivotal support 12 ofthe adjustin bars or frame 11 which carry the roll 3. gy reason of theinclination of the track relative to the bars 11, these bars will beswung upwardly as the carriage moves up the inclined track and thus theroll 3 will be raised relative to the rolls 1 and 2 to regulate theamount of bend which Will be iven the tubing or other material which iseing passed between the rolls.

a To feed the pipe or other length or lengths of stock endwise betweenthe bending rolls,

a suitable endless traveling chain or carrierl 24 is provided, saidchain comprising a plurality of pivotally connected links to each ofwhich is attached a pair of blocks 25 having formed adjacent sidesproviding a seat for the tube or other stock 26, as illustrated in Figs.4 and 5. The links forming this carrier are also provided with teeth 27thus forming a sprocket chain to engage a large driving sprocket orteeth 28 formed on the roll 2 which is mounted upon the shaft 13 andforms the bending roll 2. The sprocket teethf28 do in fact, form theface of the bending roll, the carrier chain seating upon said rollbetween the tube 26 and roll,

the roll and chain thus to ether forming the rotatable bending menagerover which the tube passes immediately after passing beneath the bendingroll 1. Mounted upon the outer end of the shaft 13 of the bending roll,is a sprocket wheel 29l engaged by a Sprocket chain 30 which passes overa ,sprocket on the driving shaft of the motor 23 and thus motion isimparted to the carrier chain from the motor, said carrier chain beingpositively driven thereby. rlhe rear end of the tube or pipe 26 issecurely fastened 'to this carrier chain, in any suitable manner, as bya clip 31, shown in Figs. 1

i and 2, and is thereby firmly attached to the chain to be forcedendwise thereby between the bending rolls, the power being applied bythe chain to the extreme rear end of the tube which is also held seatedin the seat blocks 25 of the carrier chain by said clip.

The upper run of this carrier chain is rigidly supported by a swingingframe 32 comprising parallel side bars wlth a series of rollers 33mounted between the'bars in a position to engage the lower side of thisupper run of the carrier chain and form a rigid support therefor. Theside bars of this tilting frame 32 also form a support for a sprocket 34over which the carrier chain runs at its-rear end and this tiltingv vthepipe thereby raised by reason of such bending action (the roll 3 formingthe fulcrum support for the rear end of the pipe), the carrier frame 32with its carrier chain will be tilted or turned upon the axis of the-roll 3 in a like manner and like amount, by

reason of the engagement of the roll 36 with the lower side of the bentportion of the tube, or rather, the carrier chain which is l interposedbetween the tube and this roll.

The rear end of the carrier chain is therefore automatically raised tofollow the natural upward movement of the rear end of the tube so thatit may function to force the tube endwise between thebending rolls bybeing attached to the rear without putting a bend in the tube betweenthe elevating roll 3 and the rear end ofthe tube. As the elevating roll3 forms the fulcrum or support for the tube adjacent the rolls 1 and 2todirect the tube at the proper angle between theserolls 1 and 2 and thusgive the desired bend to the tube, the rear end of the tube mustnaturally be raised to a divergent relation relative to the frame 11 andtherefore byy mounting the carrier chain supporting frame 32 so that'itmay turn freely upon an axis common with that vof the roll 3, the rearend of this carrier frame may also rise to a divergent relation to theframe 11, and this upward swinging movement of the carrier frame is madeautomatic and caused to eXactl follow the natural upward movement o therear end of the tube, by providing the roll 36 upon the free forward endof the carrier frame, which Aroll rides upon the Alower side ofthe runof the carrier chain which is in rm contact with the bent portion of thetube directly beneath the bending roll l. A direct force is thereforeapplied tothe rear end of the tube by means of the carrier chain toforce the tube endwise between the bending rolls, and the attachment ofthe rear end of the tube to the carrier chain is made possible by theautomatic tilting of the carrier frame with the natural upward movementof the rear end of the tube, so that the full length of the tube may beforced through between the bending rolls by engaging the tube with thecarrier chain at the rear end of the tube only, thus making it possibleto feed tubes of any desired length continuously through end of thetube,

between the bending rolls and have them issue in a bent form freely frombetween these rolls. A tube which is the full length of the carrier may`thus be fed through of s tubes or other pleces of stock of greaterlength or of lesser length than the carrier may be continuously forcedthrough between.

the bendin rolls, a suitable` number of deupon the carrier, and it willalsobe apparent that instead of the clips 131 other means may beemployed for attaching the stock to the carrier chain and such means mayengage over the stock in thel manner of the clips 31 or may simplyengage the rear ends Y b position to guide the tube at the desired l. 4

of the several pieces of stock.

The thrust roll 4, previously descrlbed, 1s shown in Fig. 1 as v carriedby a suitable ad'- justable bracket 38 which may be supported in anysuitable manner', as by the bracket 5,

whichcarries the roll 1. This bracket 38 is preferably so constructedthat it vmay be arljusted to bring the roll intov contact with eitherside ofthe tube and may be adjustedtoward or from the roll 1 to engagevarious sizes of turns of the coil being formed. It

will be noted that the roll 1, as shown in Fig.

l, is of considerably greater diameter in proportion to the rolls 2 and3 than as shown atv 1a in Figs. 6, 7 and 8, the smaller roll beingemployed when it is desired to form the double coil shown in Fig. 7 but-in bending coils of large diameter with considerable spacing betweenthe turns of the coil, it is not necessary to make the roll 1 of thecomparatively small size -as'illustrated in Fi 6, 7, and 8 but may bemore` nearly the s1ze of the rolls 2 and 3, as illustrated in Fig. l.

Tubespor other stock of any diameter in.

cross section may be bent by meansof the machine as illustrated, itbeing however necessary to adjust the roll 1 relative to the roll 2 upona change in diameter of the stock being bent as, in order to give theproper set to the bend of the tube, the distance between the peripheralsurface of the' roll 1 and the effective supporting surface of the roll2 must be greater than the thickness or cross sectional diameter of thestock being bent,

and it is necessary that these rolls 1y and 2 be accurately positioned.Therefore, the roll 1 is made adjustable upon its support 5, in

any suitable manner, as by provlding a verticall slot 39 in the supportto receive theA vshaft of the roll. This roll 1 may therefore beadjusted vertically relative to the roll2 and its adjustment laterallytoward and from the roll 2 is provided for'v as hereinbefore described,by mounting the support 5 pivotally 'upon the base 7. v

`In the operation of the machine,- the carriage 12 is first run tothevlower end of its track so that the adjusting frame 11 which carriesthe roll 3 willbe in a substanigaaus] tially horizontalvposition,asshown in Fig.A 1 in full lines, or, 1n a position which is vsuch thatthe forward end of a tube placedthereon itt 2. en the forward end ofthetube is above the roll 2, the carriage 15 isv moved up itsinclined'track, thus swinging the-'rear A- end of the frame 11 upwardlyand vcarryin the roll 3 upward relative to the rolls 1 ,an

'2.1 lThis upward movement or adjustment of the roll 3will bend the.tube and' form a support therefor to guide it, at the enter freely'between the rolls'lf'and I l v proper j angle, between therolls 1 andf2to give the desired bend to the tube..A The carriage 15 is thereforedrawn up the vincline just suiiciently to elevate the roll 3- to thevproper angle in orderto give the desired bend or set to the tube. At thetime of adjustment rof the carriage 15, the motor is started and at willley/adjusting the carriage 15 along its inclined track. By a continuedeven lelo adjustment of the carriage 15 relative to the 1 movement ofthe carrier chain, an even graduation of a turn of the coil from a turnof one diameter to a turn 0f another diameter may therefore beaccomplished, as

illustrated-'in Fig. 8, ,or a coil of conical form 1n which the turnsuniformly' diminishl in diameter toward pne end of the coil, may be madeby a contlnuous even adjustment of the carriage '.15 during the progressof the tube between the rolls throughout thev A time of forming theentire coil. `After the -formation of one coil of a certain diameter anddesired length, another coil of a greater diameter continuous therewithvmay bev formed -with the coil of larger diameter surrounding thesmaller coil, as illustrated vin Fig.' 7 and as previously described, by

adjusting the thrust roll 4 upon its bracket 38 and by moving thecarriage 15 during the formation of one turn of the coil, as pre'V'viously described, to form a graduated `turn connecting the two coils,the adjust- 'ment of the roll 4v into engagement with the proper side ofthe `tube' after the formation of the smaller coil, causing the turns ofthe larger coil to lead in ajdirection opposite to that of the turns ofthe smaller coil andA cause a travel of thelarge coil during, itsformation, in a longitudinal direction opposite to thatat which thesmaller coil moved when it was formed, thus forming the large' coioutside of and concentric with the small co1 v Obviously other meansthan the carrier iat.

chain, shown in Figs. 1 to 5 inclusive may be employedl for-forcing thetube endwise between the bending rolls which are pref-V erably plain.idler rolls, that is, rolls not .positively rotated 0r driven to feedthe tube forward, it only being necessary to. rovide some means 'forengaging the rear en of the tube, whichfmeans is free to'. rise withsaid end of the tube as it moves u Wardly under the force of the bendingactlon of `the roll 1 which force'will tend to swing the rear end of thetube upwardly bylreason of the engagement of the roll 3 with the lowerside of the tube 4rearwardly of the roll l, and it may be. noted that itisdesirable to have the roll 3 positioned adjacent the roll 1 so thatsubstantially the full length of the tubey will be bent to the properform and in some instances it. may-be desirable to adjust the roll 3along the frame 11 and carrier frame 32 to give the desired results..Other means than the carriage 15 may also be employed for raising therear end of the frame 11 to adjust the roll 3 relative to the rolls 1and 2 but for heav Work this carriage running upon an inclined track isfound to be the preferred means for the purposeas it requires but littlepower to operate it and gives great accuracy of adjustment. It is alsoobvious that the adjusting means, such as the carrier l5 and the meansfor forcing the tube through between the rolls,'such as the carrierchain, may be separately and independently operated by power appliedthereto in any suitable manner or may be manually operated where thework to be done requires comparatively little power, such as where wiresor tubes of small diam eter are to be bent. l

Obviously other changes in the construction and .arrangement of scope ofthe appended claimsmay also be made without departing from the spirit ofthe invention and I do not therefore limit myself to the particularconstruction shown.

Having thus fully described my invention what I claim is:

1. A bending machine wherein a plurality of rolls are provided to bendthe stock and said rolls are arranged to permit a free transversemovement of the free end portion of the stock, means for feeding thestock to the rolls, said feedin means being free to move transverselywlth the transverse movements of the rear end portion of the stock. y

2. In a bendin machine, the combination of a bending rol? to engage oneside of the stock to be bent, a second bending roll opposed to the firstbending roll and set in advance of the first bending roll in thedirection of travel of the stock, a third roll to direct the stock tosaid first and second rolls, and means for feeding the stockendwiseindependentl of the rolls, said means being free to fol ow thetransverse movements of the rear end portion of the stock caused by thebending action of the rolls.

3. In a bending machine, the combination parts within the of abendingroll tol engage one' side of the stock to be bent, a secondbending roll opposed to the first' bending roll and set in advanceof thefirst bending roll in the directionpof travel of thev stock, a thirdroll to direct the 'stock to said first and second rolls, means engagingand supporting the rearend portion of the stock for feeding the sameendwise, and means for causing said feeding means to follow thetransverse movement of said vrear end portion of the stock. 4. Inabendin machine, the combination of a bendin rol to'engage one side ofthe ent, -a second bending roll opposed t0 the first bending roll andset in advance of the first bending roll in the directi'on of travel ofthe stock, a third roll to direct the stock to said first and secondrolls, feeding means adapted to follow the transverse movement of therear end portion of the stock, and means for carrying said feeding meansand adapted to adjust said third ro l relative to said other rollssimultaneosuly with the progress of thestock and the bending thereof, toproduce a variation in the curvature of the stock issuing from betweenthe rolls.

5. In a bending machine, the combination of a bending roll to engage onesidev of the stockvto be bent, a second'bendin roll opposed to the firstbending roll an set in advance of the first bendlng roll in thedirection of travel of the stock, a third roll to direct the stock tosaid rst and 100 second rolls, means for feeding the -stock endwisebetween the rolls, adjustable means for supporting said third roll, andmeans for adjusting said adjustable means simultaneously with theprogress of the stock and the bending thereof.

`6. In a bending machine, the combination with bending rolls, of meansfor forcing stock between the rolls to issue freely from between therolls in coiled form, means for bending the stock laterally as it issuesfrom between the rolls, pivotally supported means upon which one of saidbending rolls is mounted, and means for Swingin said pivotally supportedmeans upon its pivot to adjust said `roll during the production of aturn of thecoil for varying the diameter thereof.

7. In a bending machine, the combina-- tion of bending rolls, and meansfor feeding stock endwise between the rolls, said means being engagedwith the rear end portion of the stock and operated by the bending ofthe stock to cause said means to followthe transverse movement of therear unbent end of the stock, which transverse movement is caused by thebending of the stock between-the rolls.

8. In a bending machine, the combination with bending rolls, of meansfor ad- 13@ of said frame and .means for turning 'said justingvsaidrolls relatively including a Work supporting means and member mov-A able,upon an 'incline toelfect said relative adjustment of said-ro1ls-andthe adjustment of ythe work 'simultane,0usly.y v ,i Y 1 9. In a'bendinmachine, the'combination with bendingros, of'means for adjusting one ofsaid rolls includin a framev4 pivotally supported intermediate its endsand upon which the roll is mounted adjacent one end frame upon itsivotal support.

10. In a ben ing machlne, the combination with bending rolls,' or` meansfor adjusting one of said rolls including a pivoted bending rolls,meansfor'ad'usting said third frame upon which saidroll is mounted, and\oll relative to said first an second rolls, and

means including a. member movable upon an 4 justin inclined .way forturning said frame lupon 11.. In a bending machine, the combina-.-

tion -with bending rolls, of -means forf ad-A one of saidk rollsincluding a frame pivota 1y supported adjacent one end and' upon whichsaid'roll is mounted, and means includin a member 4movablelongitudinally of" and eneath'said frame for raising the freeend ofsaidframe.

' 412. In a bending machine, the combination Vwith bendin' rolls, ofmeans for adjust?" lingl said rolls yre ativel including a swingingframe, an incline track beneath said frame, and means movable'along-said track i :for swinging said frame.

' wherein said 'track is pivotally mounted .upon said frame to turnrelatlve thereto and 13. In a nding machine, the combina` tion ofbending rolls, an endless carrier for supporting and forcing stockendwise between therolls and a pivoted track for the upper run of thecarrier. l

V14. A machineas characterized in claim 13 and further characterized inthat said. track is pivo'ted to turn upon an axis coincident with theaxis of one of said rolls.

15; A machine as ,characterized in claim ,13 and includingapivotallysupported frame upon which one of said rolls is mounted and upon an axiscoincident with. the axis of said roll.

- 16. A machine aS characterized in claim 13 andv including a pivotallysupported frame upon which one of said rolls is o mounted and whereinsald track is pivotally mounted u on said frame to turn relativetheretol an upon an axis coincident lwith f the axisosaid roll, andl.further including means carried by *saidftracky adapted to be operatedby the deflectionv of the stock when bent by sald bending rolls, forturning said track upon its pivotal support. l

, '17. A machine as characterized in claim 13 and including a pivotally'supported frame upon which one of said rolls is mounted and whereinsaid track is pivotally mountedupon saidframe to turn. relative.incidentwith the axis of said third roll,-an

carried by saidl track and in' Opposed relationto one of the bendingrolls with a ortion of the stock being bent by'said ben in'g rollinterposed.l between said roll carried by the track and said opposedbendingroll.

18. In a bending` machine, the combination of a bendin kroll vto enga eone side of the stock to be entya secon bendin roll opposed tothe lirstbending roll, a thir roll, an endless carrier chain assing over saidsecond and third rolls andp adapted tol carry l thestock to be bentendwise between ,the

' means for driving 4.the carrier chain.

19.;A machine as characterized in claim 18 and includin a track forl theupper run of the carrier c ainfpivotally supported to turn upon an axiscoincident with the axis of said'third roll. En.'

20. A machine-as 'characterizedin claim 18 and including a pivotedtra'ckmember for supporting the upper run "of/the carrier chain, anadjusting lframe-upon which said third roll is mounted, said framebeing-pivotally supported `to 'turn upon an' axis'cov'incident with theaxisof rotation oil said second roll, means rotatable upon an'axiscoincident with the axis of rotation of said second roll andf aroundwhich said endless .carrierv passes, means on the free end of thetrackmember' around which theendless carrier passes, and means on'saidtrack mem- 100 beradjacent itsl pivotal support. opposing v said roll toengage said carrier chain and tilt said track member upon its pivot.

21. In a bendingmachine, the combination of a bending roll to engage oneside of the stock to be bent, a second bending roll opposed to the firstroll, a third roll for directing the stockto said, first and secondrolls, a' frame member'pivotally supported o adjacentone end and u onwhich said third 110 roll is mounted, an inc'llne'd track extendinilongitudinally of said frame. member, an

a carriag movable along'said track between said trac and frame member, e22. AIn a bending machine, the combination of 'a bending roll to engageone side oir'` .the stock to be bent, a second bending rollopposed tothe first roll, a third roll for directing the stockto said first andsecond rolls, a rame pivotally supported lat one end upon an axiscoincident with the axis ofsaid se ond roll and upon which said thirdroll is mounted, a member forming an extended track pivotallysupportedupon an axis ,co-

12! endless carrier supported by said. track member with its upper runengaging said track throu hout the length thereof, an inclined trackeneath said frame, a carriage movable along Said track and engaging thelower lai said last named means, and means for driving the endlesscarrier.

In testimony whereof I aHX my signature in presence of two witnesses.

.MARTIN L. PETERSON.

Witnesses:

LEWIS E. FLANDERS, ANNA M. Donn.

